Patanè, G., C. Centamore, and S. La Delfa. “Isochronal Maps at Mt. Etna Volcano (Italy): A Simple and Reliable Tool for Investigating Large-Scale Heterogeneities”. Annals of Geophysics 40, no. 5 (November 25, 1997). Accessed February 22, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/3874.